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/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <console/console.h>
#include "spi_flash.h"
/*
* Protect range of SPI flash defined by [start, start+size-1] using Flash
* Protected Range (FPR) register if available.
*/
int spi_flash_protect(u32 start, u32 size)
{
struct fpr_info fpr_info;
u32 end = start + size - 1;
u32 reg;
int fpr;
uintptr_t fpr_base;
if (spi_flash_get_fpr_info(&fpr_info) == -1) {
printk(BIOS_ERR, "ERROR: FPR Info not found!\n");
return -1;
}
fpr_base = fpr_info.base;
/* Find first empty FPR */
for (fpr = 0; fpr < fpr_info.max; fpr++) {
reg = read32((void *)fpr_base);
if (reg == 0)
break;
fpr_base += sizeof(uint32_t);
}
if (fpr >= fpr_info.max) {
printk(BIOS_ERR, "ERROR: No SPI FPR free!\n");
return -1;
}
/* Set protected range base and limit */
reg = SPI_FPR(start, end) | SPI_FPR_WPE;
/* Set the FPR register and verify it is protected */
write32((void *)fpr_base, reg);
reg = read32((void *)fpr_base);
if (!(reg & SPI_FPR_WPE)) {
printk(BIOS_ERR, "ERROR: Unable to set SPI FPR %d\n", fpr);
return -1;
}
printk(BIOS_INFO, "%s: FPR %d is enabled for range 0x%08x-0x%08x\n",
__func__, fpr, start, end);
return 0;
}
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